JP2010222800A - Bolt-type slip preventing method used for composite structurization of existing steel railway bridge and concrete floor slab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bolt-type slip preventing method used for composite structurization of an existing steel railway bridge and a concrete floor slab obtaining a strong floor slab joint part without weakening the strength of an existing steel bridge. <P>SOLUTION: The bolt-type slip preventing method used for composite structurization of the existing steel railway bridge and the concrete floor slab comprises removing existing sleepers to arrange new sleepers 3 at predetermined spaces on the upper faces of steel girders 1, laying rails 6 on the new sleepers 3, inserting bolt groups 2 at predetermined spaces between the new sleepers 3, arranging axial iron bars 4 penetrating the new sleepers 3, and axial reinforcements 5 welded to the axial iron bars 4, and placing floor slab concrete between the new sleepers 3 to construct the concrete floor slab 8. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bolt-type slip prevention method used for composite structuring of an existing steel railway bridge and a concrete slab, and more particularly to reinforcement of an existing steel railway bridge.

  More than half of the existing steel railway bridges have been in service for 60 years, and it is questioned how to manage existing steel railway bridges (see Non-Patent Document 1 below).

  Conventionally, there is a technology called “composite girder (or composite structure)” that combines steel girders and concrete floor slabs, but this technology is aimed at new structures and is intended to reinforce existing steel railway bridges. No attempt has been made so far.

Masamitsu Saito, Ichiro Sugimoto, Yusuke Kobayashi, Atsushi Ichikawa, “Proposal of Renewal Method by Synthetic Structure of Existing Steel Railway Bridge”, RTRI REPORT Vol. 22, no. 10, Oct, 2008

  When it is going to carry out synthetic structuring of the existing steel railway bridge, it is necessary to remove the existing sleeper (wood sleeper or synthetic sleeper) and install a new concrete floor slab there. However, in this method, since it takes time to install the concrete floor slab, the operation of the train on that route is significantly hindered.

  Moreover, when it is going to improve the proof stress of the existing steel railway bridge by synthetic | combination structure, the joining part of a steel girder and a floor slab must have sufficient resistance with respect to a shift | offset | difference. In the case of a new composite girder, a “slipping stop” is installed on the upper surface of the steel girder, and this creates resistance against displacement of the joint. However, there is a problem that the steel girder and the floor slab are not integrated well because there is no such “slipping prevention” on the upper surface of the existing steel railway bridge, and a sufficient strength improvement effect cannot be obtained.

  On the other hand, there is also a method of attaching a stopper to the upper surface of the steel girder by welding, but many of the existing steel bridges are made of old steel, and the material becomes brittle and cracks occur by welding. Actually, it is impossible to install a slip stopper by welding due to reasons such as a decrease in fatigue strength.

  In view of the above situation, the present invention is a bolt-type shift used for composite structuring of an existing steel railway bridge and a concrete slab that can be joined to a rigid floor slab without reducing the strength of the existing steel bridge. The purpose is to provide a stopping method.

In order to achieve the above object, the present invention provides
[1] In the bolt-type slip prevention method used for the composite structuring of the existing steel railway bridge and the concrete slab, the existing sleepers are removed and new sleepers are placed on the upper surface of the steel girder at predetermined intervals. Rails are laid on the ledges, bolts are planted at predetermined intervals between the new sleepers, axial rebars that penetrate the new sleepers are placed, and floor slab concrete is placed between the new sleepers. It is characterized by casting and building a concrete slab.

  [2] In the bolt-type detent method used for the composite structuring of the existing steel railway bridge and the concrete slab described in [1], an axial reinforcing bar is projected from the new sleeper in advance to the new sleeper. The axial rebar is arranged between the new sleepers, and the protruding axial rebar bar and the axial rebar are welded.

  [3] In the bolt type slip prevention method used for the composite structuring of the existing steel railway bridge and the concrete slab described in [1] above, an axial rebar insertion hole is previously formed in the new sleeper, An axial rebar is disposed through the axial rebar through the axial rebar insertion hole.

  [4] In the bolt type slip prevention method used for the composite structuring of the existing steel railway bridge and the concrete slab described in [1], the axial reinforcing bars are knitted to the bolt group. .

  According to the present invention, it is possible to construct a composite structure of an existing steel railway bridge and a concrete floor slab that can be joined to a rigid floor slab without weakening the strength of the existing steel bridge.

  Also, in the present invention, first, by replacing the existing sleeper with a special concrete sleeper and using a construction method in which concrete is placed around the concrete sleeper and integrated, each work is made into a plurality of single-time work. The concrete slab can be installed only by a short-time work such as a night work without interrupting the train operation.

It is a schematic diagram which shows the concept of synthetic | combination structuring with the existing steel railway bridge and concrete floor slab of this invention. It is process drawing of the bolt type slip prevention method used for synthetic | combination structuring of the existing steel railway bridge and concrete floor slab which shows 1st Example of this invention. It is process drawing of the bolt type slip prevention method used for synthetic | combination structuring of the existing steel railway bridge and concrete floor slab which show 2nd Example of this invention.

  The bolt type slip prevention method used for the composite structuring of the existing steel railway bridge and the concrete slab of the present invention is to remove the existing sleepers, place new sleepers on the upper surface of the steel girder at predetermined intervals, and Rails are laid on the slats, bolts are planted at a predetermined interval between the new sleepers, axial rebars penetrating the new sleepers are placed, and concrete is placed between the new sleepers. Build a concrete slab.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a schematic diagram showing the concept of composite structuring of an existing steel railway bridge and a concrete slab of the present invention.

  Fig.1 (a) is an existing bridge sleeper type bridge, and this is replaced with a sleeper as shown in Fig.1 (b), and a composite structure using a concrete slab is planned to renew the existing steel railway bridge. It is intended to make it easier.

  FIG. 2 is a process diagram of a bolt-type slip prevention method used for forming a composite structure of an existing steel railway bridge and a concrete slab according to the first embodiment of the present invention.

  In this figure, 1 is a steel girder, 2 is a bolt group arranged on the upper surface of the steel girder 1, 3 is a new sleeper (concrete sleeper), and 4 is an axial direction fixed so as to protrude from the new sleeper 3. A reinforcing bar 5 is an axial reinforcing bar, and 6 is a rail disposed on the new sleeper 3.

  First, as shown to Fig.2 (a), the bolt group 2 is planted on the upper surface of the steel girder 1, and the new sleeper (concrete sleeper) 3 with the axial direction reinforcing bar 4 is arrange | positioned at predetermined intervals. Here, the rail 6 is not laid again at the end of the construction, but when the new sleeper 3 is installed between the old sleepers at the beginning of the construction, the rail 6 is also attached to the new sleeper 3 (the old sleeper Remove from). If this method is used, even if it takes time to place concrete, the new sleeper already supports the rail, so it is possible to pass the train.

  Next, as shown in FIG. 2 (b), the axial reinforcing bar 5 is disposed between the axial reinforcing bar 4, and the axial reinforcing bar 4 protruding from the new sleeper 3 and the axial reinforcing bar 5 are welded. At that time, the lower axial rebar 5 is knitted to the bolt group 2. Therefore, the bolt group 2 is firmly fixed to the axial rebar 5.

  Next, as shown in FIGS. 2 (c) and 2 (d), the formwork 7 is placed, and concrete for floor slabs is placed between the new sleepers 3 so as to be integrated with the new sleepers 3.

  Next, as shown in FIG. 2 (e), the mold 7 is removed and removed, and as shown in FIG. 2 (f), a composite structure of the existing steel railway bridge and the concrete slab 8 is completed. To do.

  FIG. 3 is a process diagram of a bolt-type slip prevention method used for composite structuring of an existing steel railway bridge and a concrete slab showing a second embodiment of the present invention.

  In this figure, 11 is a steel girder, 12 is a bolt group arranged on the upper surface of the steel girder 11, 13 is a new sleeper (concrete sleeper), and 14 is an insertion hole for an axial reinforcing bar formed in the new sleeper 13. , 15 is an axial rebar, and 16 is a rail disposed on the new sleeper 13.

  First, as shown to Fig.3 (a), the bolt group 12 is planted on the upper surface of the steel girder 11, and the new sleeper 13 with the insertion hole 14 of an axial rebar is arrange | positioned at predetermined intervals. The rail 16 is laid in the same manner as in the first embodiment.

  Next, as shown in FIG. 3 (b), the axial rebar 15 is disposed through the new sleeper 13. At that time, the lower axial rebar 15 is knitted to the bolt group 12. Therefore, it is firmly fixed to the bolt group 12 and the axial rebar 15.

  Next, as shown in FIGS. 3 (c) and 3 (d), the formwork 17 is placed, and concrete for floor slabs is placed between the new sleepers 13 and integrated with the new sleepers 13.

  Next, as shown in FIG. 3 (e), the mold 17 is removed and removed, and as shown in FIG. 3 (f), a composite structuring of the existing steel railway bridge and the concrete slab 18 is completed. To do.

  In this way, the existing sleepers are removed, and anti-slip bolts, axial rebars and formwork are installed in the gaps between the concrete sleepers as new sleepers.

  The concrete for floor slab is poured into the formwork in the gap between the concrete sleepers and integrated with the concrete sleeper to complete the concrete floor slab.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The bolt type slip prevention method used for the composite structuring of the existing steel railway bridge and the concrete slab of the present invention can be used to reinforce the existing steel railway bridge.

1,11 Steel girder 2,12 Bolt group 3,13 New sleeper (concrete sleeper)
4 Reinforcing bar 5, 15 Reinforcing bar 6, 16 Rail 7, 17 Formwork 8, 18 Concrete floor slab 14 Insertion hole for axial rebar

Claims (4)

  Remove the existing sleepers, place new sleepers on the upper surface of the steel girder at predetermined intervals, lay rails on the new sleepers, and plant bolts at predetermined intervals between the new sleepers, An existing steel railway bridge and a concrete floor slab characterized by arranging an axial reinforcing bar penetrating the new sleeper, placing concrete for a floor slab between the new sleepers, and constructing a concrete floor slab Bolt-type slip prevention method used for composite structuring.   In the bolt type non-slip construction method used for the composite structuring of the existing steel railway bridge and the concrete slab according to claim 1, an axial reinforcing bar is previously fixed to the new sleeper so as to protrude from the new sleeper. In addition, an axial rebar is disposed between the new sleepers, and the projecting axial rebar and the axial rebar are welded together. Bolt type slip prevention method used.   In the bolt type non-slip construction method used for the composite structuring of the existing steel railway bridge and the concrete slab according to claim 1, an axial rebar insertion hole is formed in the new sleeper in advance, and the axial rebar insertion is performed. Bolt-type detent method used for composite structuring of existing steel railway bridges and concrete slabs, characterized in that axial rebars are arranged through the steel holes.   An existing steel railway bridge according to claim 1, wherein said axial rebar is knitted into said bolt group in a bolt type detent method used for composite structuring of an existing steel railway bridge and a concrete floor slab. Bolt type slip prevention method used for composite structuring of steel and concrete slabs.

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